Guys I'm after some feedback from people who use Joe Gibbs CSP Coolant Protector.

I was advised to use this product by my engine builder after my small block was rebuilt, I also had the radiator pulled and cleaned out. I mix the JB CSP with demineralised water, not regular town water.

My car doesn't run hot so all is good there however I have noticed that there is a brown scum inside the radiator when I check the level [my car has factory a/c so no overflow tank] I assume this scum is probably throughout the engine coolant passages.

Has anyone else had this issue, is it something I should be concerned about and how do I rectify the problem.??

The product description says it for use when not using distilled water. You are using distilled water, so why use this stuff?I asked Tom DeWitt what kind of antifreeze I should use in his aluminum radiator, and he said it doesn't matter, but only use distilled water with it. No tap, soft, or spring water, just distilled.

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